"They did not need to go to those lengths. He was actually walking out. He could've been out the door and still alive."

Mr Dunning had been visibly intoxicated and was standing on the gaming room floor playing with his mobile telephone moments before the encounter with bouncers.

He was first seen by Mr Lawson, who asked for security camera coverage before asking Mr Dunning to leave.

Initially, Mr Dunning complied, but then he allegedly became aggressive and swore.

After speaking with bouncers for some time, Mr Dunning began to walk off, but at one point he turned around to look back at an incident involving two of his friends and was taken to the floor.

Prosecutor Andrew Tinney SC told the jury Mr Dunning was "senselessly and needlessly and violently" brought to the ground.

He was then set upon by the bouncers, who applied "excessive and dangerous and entirely unnecessary physical force", he said.

Mr Lawson's barrister, Ian Hill QC, said his client was simply doing his job by ejecting an intoxicated patron.

"This (is a) man with no prior criminal conviction who on that night was doing his job," Mr Hill said.

"This is not about negligence. It's not about carelessness. This is about the elements of a very serious criminal offence."

He said Mr Dunning had pre-existing gross heart disease and morbid obesity.

Sanderson's barrister, Michael Tovey QC, told jurors they would not be satisfied with the prosecution's argument that while Mr Dunning was on the ground Mr Sanderson aided and abetted Mr Lawson who was carrying out an unlawful and dangerous act.

Police will now prepare a separate brief of evidence for the coroner, which will be examined to determine if an inquest will be held.

Mr Dunning's family say they will fight for security footage of the incident to be publicly released.

In a statement, Crown Casino said it was not in a position to comment.

"Crown has been advised of the jury's verdict and is considering its implications," the statement said.

A Crown Casino spokesman declined to comment on whether the bouncers would be reinstated as frontline security staff.